feat(shells): zoxide cd replacement in all three shells + guarded system-wide oh-my-zsh source

dotfiles/bash/.bashrc

@@ -12,3 +12,6 @@ PS1='[\u@\h \W]\$ '
 # peon-ping quick controls
 alias peon="bash /home/dank/.claude/hooks/peon-ping/peon.sh"
 [ -f /home/dank/.claude/hooks/peon-ping/completions.bash ] && source /home/dank/.claude/hooks/peon-ping/completions.bash
+
+# zoxide replaces cd in interactive shells; plain paths still pass through
+command -v zoxide >/dev/null && eval "$(zoxide init bash --cmd cd)"

dotfiles/fish/.config/fish/config.fish

@@ -8,3 +8,8 @@ source /usr/share/cachyos-fish-config/cachyos-config.fish
 
 # peon-ping quick controls
 function peon; bash /home/dank/.claude/hooks/peon-ping/peon.sh $argv; end
+
+# zoxide replaces cd in interactive shells; plain paths still pass through
+if command -q zoxide
+    zoxide init fish --cmd cd | source
+end

dotfiles/zsh/.zshrc

@@ -1,5 +1,14 @@
 source /usr/share/cachyos-zsh-config/cachyos-config.zsh
 
+# oh-my-zsh (system-wide package; no-ops where not installed)
+if [ -f /usr/share/oh-my-zsh/oh-my-zsh.sh ]; then
+  export ZSH=/usr/share/oh-my-zsh
+  source "$ZSH/oh-my-zsh.sh"
+fi
+
+# zoxide replaces cd in interactive shells; plain paths still pass through
+command -v zoxide >/dev/null && eval "$(zoxide init zsh --cmd cd)"
+
 # To customize prompt, run `p10k configure` or edit ~/.p10k.zsh.
 [[ ! -f ~/.p10k.zsh ]] || source ~/.p10k.zsh